package servlet;


import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import util.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("utf-8");
        String action = req.getParameter("action");
        if("list".equals(action)){
            String name=req.getParameter("name");
            String pass=req.getParameter("pass");
            String currentPage=req.getParameter("currentPage");
            if(currentPage==null){
                currentPage="1";
            }
            int int_currentPage=Integer.parseInt(currentPage);
            Page page=new Page();

            User condition=new User(name,pass);
            // 查询总记录数
            int totalCount=userService.count(condition);
            // 绑定page相关参数
            page.setTotalCount(totalCount);
            page.setCurrentPage(int_currentPage);
            page.setTotalPage();
            // 计算偏移量
            int offset=(int_currentPage-1)*page.getPageSize();

            List<User> users = userService.findAll(condition,offset,page.getPageSize());
            // 把数据放到请求域中
            req.setAttribute("users", users);
            req.setAttribute("offset", offset);
            req.setAttribute("page", page);
            //转发
            // 在哪个页面显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        }else if("add".equals(action)){
            String name=req.getParameter("name");
            String pass=req.getParameter("pass");
            int result=userService.addUser(new User(name,pass));
            if(result>0){
                resp.sendRedirect("user?action=list");//重定向
            }else{
                resp.sendRedirect("addUser.jsp");
            }
        }else if("delete".equals(action)){
            String sid=req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            int result=userService.deleteUserById(id);
            if(result>0){
                resp.sendRedirect("user?action=list");//重定向
            }
        }else if("toupdate".equals(action)){
            String sid=req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            User user=userService.findById(id);
            req.setAttribute("user",user);
            req.getRequestDispatcher("update.jsp").forward(req,resp);
        }else if("update".equals(action)){
            String sid=req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            String name=req.getParameter("name");
            String pass=req.getParameter("pass");
            int result=userService.updateUser(new User(id,name,pass));
            if(result>0){
                resp.sendRedirect("user?action=list");//重定向
            }else{
                resp.sendRedirect("addUser.jsp");
            }
        }


    }
}
